Of course we provide an English recovery in our original firmware. The menu on your picture is NOT the recovery mode. This is the way you can open it:1 Power off and then press Power and Volume-up together for around 10 Seconds2 be sure that the little arrow point on recovery (select with volume up, enter with volume down)3 Then the open android with red triangle+"no command" is shown - press Power and Volume up together again

I edited your answer to make my answer more understandable.I do 1, 2, 3 and I get back to menu 2Not once but tried multiple times...

I edited your answer to make my answer more understandable.I do 1, 2, 3 and I get back to menu 2Not once but tried multiple times...

I know, now I should factory reset and flash to the latest firmware

If you are not able to access English recovery your phone is not like it should.At Number 2 be sure to select recovery with volume up, enter with volume down.If this don't work I suggest a clean flash over SP flash tool on PC.

I did a clean flash of 20170717 and now I do 1, 2, 3 and get a black screen, phone is powered off.I tried to press less long but no effect, as soon as the Android with red triangle dissappears the phone is powered off.I flashed again but no difference - if I continue to press vol up and power longer I get back to 2 - exactly like before.

So I flashed 20170622 but the result remains the same, from 3 pressing vol up and power after like 7 seconds the screen gets black and pressing 5 seconds more I'm back at screen 2.Same behaviour like initially and independend of the ROM version.